Only 20% of the population (maybe less) need to understand the how and why, the remaining 80% will take it upon faith of others to know it works.
Less. An organized and well connected 5% could bring the other 95% on their own. This just needs time.
We need to help businesses that have been bullied by the banks to sign up. See my previous note about PrivacyDevil.com and how the owner was forced to remove Bitcoin accepted from his site and packaging yet still had his bank accounts with Barclays and HSBC closed as they don't like Bitcoin.